I have sort of the same problem as descibed above. I've experienced it before under WinXP, and was not able to figure it out then.
But the weirdest thing is that when it happened this time, it didn't happen before after the second install of MP!L. (I reinstalled MP!L in order to fix a bug with opening a new chat window. it took ages and a lot of CPU. Also had this problem under WinXP)
Is it maybe possible to reinstall some fresh versions of something that MP!L uses to encrypt logs?.
(running Vista Ulitmate 32-bit btw)
--
And btw, thank you Patchou for all of MP!
Love it. MSN Msg isn't the same without